ILP 25/33 Installation Manual
Rev. 1.4
- 37 -
12.4
Sub-frame Installation (Optional)
Trailer installations require a sub-frame to be installed prior to installing the liftgate.
Never work under platform without safety supports.
Steps:
1. Sub-Frame: Position the sub-frame channels up against the trailers crossmembers in the orientation
shown below. Weld the sub-
frame channel to multiple crossmembers. Use 3/16” welds to secure the
sub-frame to a minimum of four crossmembers.
Subframe
Channel
30"x14"
Crossmembers
Dimension determines
the distance of the
mount plates.
Trailer Frame
w/Sub-Frame
Channels
3/16"
Sub-frame
Channel
Trailer
Sliding
Rail
Cross
members
Weld to
Multiple
Cross
Members
Rear
Sill
Crossmember
Side View
Tie subframe
to rear Sill
2. Support Plates: Install three support plates per sub-frame channel as shown and secure the plates
with 3/16” welds.
10.50"
10.50"
Support Plate
Support
Plate
Trailer Rear View
Side View
Mount
Plates
3/16"
2X
3. After installing the sub-frame, follow the installation procedure in Section 12 to complete the liftgate
installation.